Queen of the South picked up their first home win in the Championship since September to end Morton's seven-game unbeaten run.
Queen of the South 3 Greenock Morton 0 HT: 0-0 Scorers: Queens -
Lyle 71 Jacobs 83 Thomson (90+3)
Derek Lyle opened the scoring on 71 minutes with a close range header.
Kyle Jacobs then thundered in a fantastic strike from 30 yards, which went in via the underside of the crossbar.
Joe Thomson completed the scoring, shooting home after a run from the edge of his own penalty box.
Morton drop a place to fourth, with Falkirk overtaking the Greenock side after a win against Dunfermline.
Queens are six points behind the final play-off place and have played two more games than Jimmy Duffy's men.
Images by courtesy of www.qosfc.com